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Simplifying 7 + -1(a + 9) = 16 Reorder the terms: 7 + -1(9 + a) = 16 7 + (9 * -1 + a * -1) = 16 7 + (-9 + -1a) = 16 Combine like terms: 7 + -9 = -2 -2 + -1a = 16 Solving -2 + -1a = 16 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -1a = 16 + 2 Combine like terms: -2 + 2 = 0 0 + -1a = 16 + 2 -1a = 16 + 2 Combine like terms: 16 + 2 = 18 -1a = 18 Divide each side by '-1'. a = -18 Simplifying a = -18
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